/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.lb.material_preferences_library.custom_preferences;

import android.content.Context;
import android.content.DialogInterface;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v7.app.AlertDialog.Builder;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.widget.ArrayAdapter;

import com.lb.material_preferences_library.R;

/**
 * A {@link Preference} that displays a list of entries as
 * a dialog.
 * <p>
 * This preference will store a string into the SharedPreferences. This string will be the value
 * from the {@link #setEntryValues(CharSequence[])} array.
 *
 * @attr ref android.R.styleable#ListPreference_entries
 * @attr ref android.R.styleable#ListPreference_entryValues
 */
public class ListPreference extends DialogPreference
  {
  private CharSequence[] mEntries;
  private CharSequence[] mEntryValues;
  private String mValue;
  private String mSummary;
  private int mClickedDialogEntryIndex;
  private boolean mValueSet;

  public ListPreference(Context context,AttributeSet attrs,int defStyleAttr,int defStyleRes)
    {
    super(context,attrs,defStyleAttr,defStyleRes);
    }

  public ListPreference(Context context,AttributeSet attrs,int defStyleAttr)
    {
    super(context,attrs,defStyleAttr);
    }

  public ListPreference(Context context,AttributeSet attrs)
    {
    this(context,attrs,R.attr.dialogPreferenceStyle);
    }

  public ListPreference(Context context)
    {
    this(context,null);
    }

  @Override
  protected void init(final Context context,final AttributeSet attrs,final int defStyleAttr,final int defStyleRes)
    {
    super.init(context,attrs,defStyleAttr,defStyleRes);
    TypedArray a=context.obtainStyledAttributes(
            attrs,R.styleable.ListPreference,defStyleAttr,defStyleRes);
    mEntries=a.getTextArray(R.styleable.ListPreference_entries);
    mEntryValues=a.getTextArray(R.styleable.ListPreference_entryValues);
    a.recycle();

        /* Retrieve the Preference summary attribute since it's private
         * in the Preference class.
         */
//    a=context.obtainStyledAttributes(attrs,
//            R.styleable.Preference,defStyleAttr,defStyleRes);
//    mSummary=a.getString(R.styleable.Preference_summary);
//    a.recycle();
    mSummary=super.getSummary()==null?null:super.getSummary().toString();
    }

  /**
   * Sets the human-readable entries to be shown in the list. This will be
   * shown in subsequent dialogs.
   * <p>
   * Each entry must have a corresponding index in
   * {@link #setEntryValues(CharSequence[])}.
   *
   * @param entries The entries.
   * @see #setEntryValues(CharSequence[])
   */
  public void setEntries(CharSequence[] entries)
    {
    mEntries=entries;
    }

  /**
   * @param entriesResId The entries array as a resource.
   * @see #setEntries(CharSequence[])
   */
  public void setEntries(int entriesResId)
    {
    setEntries(getContext().getResources().getTextArray(entriesResId));
    }

  /**
   * The list of entries to be shown in the list in subsequent dialogs.
   *
   * @return The list as an array.
   */
  public CharSequence[] getEntries()
    {
    return mEntries;
    }

  /**
   * The array to find the value to save for a preference when an entry from
   * entries is selected. If a user clicks on the second item in entries, the
   * second item in this array will be saved to the preference.
   *
   * @param entryValues The array to be used as values to save for the preference.
   */
  public void setEntryValues(CharSequence[] entryValues)
    {
    mEntryValues=entryValues;
    }

  /**
   * @param entryValuesResId The entry values array as a resource.
   * @see #setEntryValues(CharSequence[])
   */
  public void setEntryValues(int entryValuesResId)
    {
    setEntryValues(getContext().getResources().getTextArray(entryValuesResId));
    }

  /**
   * Returns the array of values to be saved for the preference.
   *
   * @return The array of values.
   */
  public CharSequence[] getEntryValues()
    {
    return mEntryValues;
    }

  /**
   * Sets the value of the key. This should be one of the entries in
   * {@link #getEntryValues()}.
   *
   * @param value The value to set for the key.
   */
  public void setValue(String value)
    {
// Always persist/notify the first time.
    final boolean changed=!TextUtils.equals(mValue,value);
    if(changed||!mValueSet)
      {
      mValue=value;
      mValueSet=true;
      persistString(value);
      if(changed)
        {
        notifyChanged();
        }
      }
    }

  /**
   * Returns the summary of this ListPreference. If the summary
   * has a {@linkplain java.lang.String#format String formatting}
   * marker in it (i.e. "%s" or "%1$s"), then the current entry
   * value will be substituted in its place.
   *
   * @return the summary with appropriate string substitution
   */
  @Override
  public CharSequence getSummary()
    {
    final CharSequence entry=getEntry();
    if(mSummary==null)
      {
      return super.getSummary();
      }
    else
      {
      return String.format(mSummary,entry==null?"":entry);
      }
    }

  /**
   * Sets the summary for this Preference with a CharSequence.
   * If the summary has a
   * {@linkplain java.lang.String#format String formatting}
   * marker in it (i.e. "%s" or "%1$s"), then the current entry
   * value will be substituted in its place when it's retrieved.
   *
   * @param summary The summary for the preference.
   */
  @Override
  public void setSummary(CharSequence summary)
    {
    super.setSummary(summary);
    if(summary==null&&mSummary!=null)
      {
      mSummary=null;
      }
    else if(summary!=null&&!summary.equals(mSummary))
      {
      mSummary=summary.toString();
      }
    }

  /**
   * Sets the value to the given index from the entry values.
   *
   * @param index The index of the value to set.
   */
  public void setValueIndex(int index)
    {
    if(mEntryValues!=null)
      {
      setValue(mEntryValues[index].toString());
      }
    }

  /**
   * Returns the value of the key. This should be one of the entries in
   * {@link #getEntryValues()}.
   *
   * @return The value of the key.
   */
  public String getValue()
    {
    return mValue;
    }

  /**
   * Returns the entry corresponding to the current value.
   *
   * @return The entry corresponding to the current value, or null.
   */
  public CharSequence getEntry()
    {
    int index=getValueIndex();
    return index>=0&&mEntries!=null?mEntries[index]:null;
    }

  /**
   * Returns the index of the given value (in the entry values array).
   *
   * @param value The value whose index should be returned.
   * @return The index of the value, or -1 if not found.
   */
  public int findIndexOfValue(String value)
    {
    if(value!=null&&mEntryValues!=null)
      for(int i=mEntryValues.length-1;i>=0;i--)
        if(mEntryValues[i].equals(value))
          return i;
    return -1;
    }

  private int getValueIndex()
    {
    return findIndexOfValue(mValue);
    }

  @Override
  protected void onPrepareDialogBuilder(Builder builder)
    {
    super.onPrepareDialogBuilder(builder);
    if(mEntries==null||mEntryValues==null)
      {
      throw new IllegalStateException(
              "ListPreference requires an entries array and an entryValues array.");
      }
    mClickedDialogEntryIndex=getValueIndex();
    //    final ListView listView=new ListView(getContext());
//    listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
//    listView.setOnItemClickListener(new OnItemClickListener()
//    {
//    @Override
//    public void onItemClick(final AdapterView<?> parent,final View view,final int position,final long id)
//      {
//      listView.setItemChecked(position,true);
//      if(position>=0&&getEntryValues()!=null)
//        {
//        String value=getEntryValues()[position].toString();
//        if(callChangeListener(value)&&isPersistent())
//          setValue(value);
//        }
//      mDialog.dismiss();
//      }
//    });
//    listView.setAdapter(new ArrayAdapter<>(getContext(),R.layout.mpl__simple_list_item_single_choice,entries));
    //            builder.setView(listView);

    builder.setSingleChoiceItems(new ArrayAdapter<>(getContext(),R.layout.mpl__simple_list_item_single_choice,mEntries),mClickedDialogEntryIndex,
            new DialogInterface.OnClickListener()
            {
            public void onClick(DialogInterface dialog,int which)
              {
              mClickedDialogEntryIndex=which;

                        /*
                         * Clicking on an item simulates the positive button
                         * click, and dismisses the dialog.
                         */
              ListPreference.this.onClick(dialog,DialogInterface.BUTTON_POSITIVE);
              dialog.dismiss();
              }
            });

        /*
         * The typical interaction for list-based dialogs is to have
         * click-on-an-item dismiss the dialog instead of the user having to
         * press 'Ok'.
         */
    builder.setPositiveButton(null,null);
    }

  @Override
  protected void onDialogClosed(boolean positiveResult)
    {
    super.onDialogClosed(positiveResult);

    if(positiveResult&&mClickedDialogEntryIndex>=0&&mEntryValues!=null)
      {
      String value=mEntryValues[mClickedDialogEntryIndex].toString();
      if(callChangeListener(value))
        {
        setValue(value);
        }
      }
    }

  @Override
  protected Object onGetDefaultValue(TypedArray a,int index)
    {
    return a.getString(index);
    }

  @Override
  protected void onSetInitialValue(boolean restoreValue,Object defaultValue)
    {
    setValue(restoreValue?getPersistedString(mValue):(String)defaultValue);
    }

  @Override
  protected Parcelable onSaveInstanceState()
    {
    final Parcelable superState=super.onSaveInstanceState();
    if(isPersistent())
      {
// No need to save instance state since it's persistent
      return superState;
      }

    final SavedState myState=new SavedState(superState);
    myState.value=getValue();
    return myState;
    }

  @Override
  protected void onRestoreInstanceState(Parcelable state)
    {
    if(state==null||!state.getClass().equals(SavedState.class))
      {
// Didn't save state for us in onSaveInstanceState
      super.onRestoreInstanceState(state);
      return;
      }

    SavedState myState=(SavedState)state;
    super.onRestoreInstanceState(myState.getSuperState());
    setValue(myState.value);
    }

  private static class SavedState extends BaseSavedState
    {
    String value;

    public SavedState(Parcel source)
      {
      super(source);
      value=source.readString();
      }

    @Override
    public void writeToParcel(Parcel dest,int flags)
      {
      super.writeToParcel(dest,flags);
      dest.writeString(value);
      }

    public SavedState(Parcelable superState)
      {
      super(superState);
      }

    public static final Parcelable.Creator<SavedState> CREATOR=
            new Parcelable.Creator<SavedState>()
            {
            public SavedState createFromParcel(Parcel in)
              {
              return new SavedState(in);
              }

            public SavedState[] newArray(int size)
              {
              return new SavedState[size];
              }
            };
    }

  }
